Cast truck-bolster.



PATBNTED FEB. 13, 1906.

E. Q. WASHBURN. CAST TRUCK BOLSTER.

APPLICATION FILED M1115, 1905.

'lill/Iliff) EDWYIN C. VASHBURN, OF

PiFlllE-lllll SF" MIN N .EAPOLlS M lNNlDSUll-i oes'r TRUCK-Beieren i', Specification of Letters Patent.

Patented Feb. 13. i908.

Application ned March 25, 1905. 'serial No. 251,948.-

To all whom it may concern.- y

Be it known that I, EDWLN C. WASHBURN,

y. a citizen of the 'United States, residing at Minparts being shown in elevation.

trate ing-surfaces 5 on the ends neapolis, inl the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Cast Truck- Bolsters; and l do hereby declare the Jfollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

My invention relates to cars, and has for its especial object an improved cast truck-bol ster.

To this end the invention consists ofthe novel devices and combination ofdevices hereinafter described, and defined in the claims.

In the accompanying draWingaWhch illusmy-invention, like characters indicate like parts throughout the several views.

Figure 1 is a view showing my invention applied to a car, the parts being shown 'chiefly in transverse vertical sections,

Fig. 2 is a vertical section taken on the line 1v of Fig. 1. Fig. 3 is a horizontal section'taken on line :v3 :c3 of Fi 2, and Fig; 4 is a vertical section taken o'n ine :r4 :1:4 of Fig. 1. 'v

The numeral 1 indicates the trussed side frames of the car-truck, Which side frames are indicated by a transom 2.

The numeral 3 indicates as truck-bolster, which at its ends is sup orted from the side frames, with freedom for hmited lateral movement, preferably and asshown by lateral-motiondevices oflthe character set forth and claimed ina companion ap lication filed of even date he. en/ith, Latera -motion devices for car-trucks. lBriefly described, these lateral-motion devices vcomprise flattened rollers 4, that are arranged in pairs and are interposed between flat bearof the bolster and flat bearinglates 67 that are mounted to move vertical y'on the bolster-columns of the truck frame and frame by springs and at its upper an entirety the are supported from said 7. At its central portion surface truck'- bolster 3 is formed with an annular flange 8, that aifords one member of a center bearing. Extending downward through the bolster 3, in a e with the axis of the flange 8, said bolster is formed With an internal bearingsleeve 9. Said bolster 3 from its central portion toward its ends tapers .in

but some l duced end portions thereofA are preferably `formed with depending side flanges 3a, that extend below and on opposite sides of the 'lat bearing-surfaces 5, and thus reinforce said end portions.' The interior oi' the bolster 3 is i castholloiv, but is formed with a verticaiiongitudinally-extended central web 10. From the opposite faces ot the web .l0 are integrally cast reinforcing-ribs 1l and 12, th s cross each other. The ribs 11 actin tension, while the ribs 12 act in compression under the Weight of the load on bolster. The outside webs of l the bolster 3 are cut away at 3b, thus light# ening the structure Without materially Weakening the same.

It is obvious that under the Weight of the load on the truck-bolsterits upper portion acts in compression, while its lower portion acts in tension. The reinforcing-ribs 11,. it Will be noted, extend approximatelyparallel to the inclined lower Web portion or' the bolster, so that they very materially strengthen the bolster and, in fa'ct, makeunnecessary the use of reinforcing tension-ribs, such as are frequently employed. The 12 act in com ression to transfer aportion rof the strain olf' t eload from the center bearing afllially olitwardto the lower portion of the o s er.

The numeral 13 indicates as an entirety an integrally-cast body 'bo'lster, which, as is usual, is radially secured. by bolts or other suitable devices (not shown) to the cantine Abers. 14. This bodv-bolster, like the truckbolster, is cast hollow and is formen with a centrally longitudinally extended Web l5 from the opposite sides of which project rein forcing-ribs 16 and 17. Also the side Webs of the body-bolster 13 are cut away at 13b. At its cent1-al portion the body-bolster 13 is formed with an integral vertically-extended sleeve 18', that is adapted to register with l sleeve 9. of the truck-bolster, so that a king bolt (not shown) may be passed-'through the two alined sleeves.-

integrally cast with and depending from the lower web of the body-bolster 13, surn rounding the'lower portion of the vsleeve 18, is a hub 19, that ii ts Within the flanges 8 ofv the l truclcbolster 3 and constitutes the other member of the center bearing. A

ls shown side bearings substantialiy ef the form set Iorth and claimed in a compan-q ion application filed by me of even date hereavertical plane, and the relwith and entitled Side bearing for carreinforcinfreribs IIO.

` it is only necessary to. note the concave to ers 20 and the guide-ribs. 21`and 22, east, 5 res tvel onthe-bolsters 3 and 13.- 1-

' om W at has been said it Willbe under-.1

stood that the device as desepibed is'ea'pable of modification Within the scope of myinvention as herein' se'tforth sind claimed.

Io What I elaim and desire to secure by Letters .Patent of the 'United Statesfis .as follows: 'f

1.- A hollow converging .upper and 4lower Web"po11tons 15' and having a. central longitudinalndverti-L cally-extended web formed with a reinforcedl ll'ib that extends the lower web lof sal bolster and with "land having 08st bolstel` having outwardly#l l segibed.

v'virdly-'converging up the vertice ltendedl central web 1 0.prov1 site faces with the transversely-extended reinforcing-dbs 1). and 12, lseid ribs ll'extending apjllximatelyparallel withA the bottom web o nidbolster. and thes'aid rib 12 ex# tendin om the top Web to the bottom web i of 'said lster..

ln'timony whereof'l'. 'affix my signature in pres ce of two Witnesses. EDWIN C# WASHBURN.

" Witnesses:

approximately parallel t0' `theupper web tlier'eof, substantially as del 4o.- 2. A hollow cast truck-bolster having outer and .lower websed on its oppo-v 

